DE102016217764A1 - Waste heat recovery system - Google Patents

Abstract

The invention relates to a waste heat recovery system 3 for an internal combustion engine 1, comprising a working fluid circuit 19 with a condenser 31, which is further connected to a working fluid cooling circuit 34, and wherein the working fluid cooling circuit 34 has a cooler 35. According to the invention, there is provided a waste heat recovery system 3 with a working fluid cooling circuit 34 that is improved in terms of forming a working fluid cooling circuit 34. This is achieved by the fact that the working fluid cooling circuit 34 has a cooler bypass 46. As a result of this configuration, a part of the coolant volume flow can be guided past the cooler 35 in a very general manner. This is particularly advantageous at low temperatures, since otherwise very low pressures in the working fluid cooling circuit 34 occur.

Description

The invention relates to a waste heat recovery system for an internal combustion engine, comprising a working fluid circuit with a condenser, which is further connected to a working fluid cooling circuit, and wherein the working fluid cooling circuit comprises a radiator.

State of the art

Such a waste heat recovery system for an internal combustion engine is known from DE 10 2013 205 648 A1 known. Here, a working fluid circuit of the exhaust heat recovery system includes an evaporator connected in an exhaust pipe of the internal combustion engine, an expansion engine, a condenser, and a working fluid pump. The condenser has a working fluid cooling supply line and a working fluid cooling discharge line which can form their own working fluid cooling circuit with a radiator or can be connected to a coolant circuit of the internal combustion engine. In this case, a controllable by a bypass valve bypass is arranged between the Arbeitsfluidkühlzuführleitung and the Arbeitsfluidkühlabführleitung.

Another waste heat recovery system is from the DE 10 2014 019 684 A1 known. This waste heat recovery system has a working fluid circuit which cooperates with a switched on in a coolant circuit of an internal combustion engine heat exchanger. The internal combustion engine has a cooling system with the coolant circuit and with at least one coolant pump and a coolant radiator. In this case, the heat exchanger is a capacitor which is switched directly into the working fluid circuit.

The invention has for its object to provide a waste heat recovery system with a working fluid cooling circuit, which is improved in terms of a formation of a working fluid cooling circuit.

Disclosure of the invention

This object is achieved in that the working fluid cooling circuit has a radiator bypass. As a result of this configuration, a part of the coolant volume flow flowing through the working fluid cooling circuit can very generally be led past the cooler. This is particularly advantageous at low temperatures, since otherwise very low pressures arise in the working fluid cooling circuit. These low pressures in turn mean high demands on the components and the capacity of the working fluid cooling circuit. In addition, at low pressures in the working fluid cooling circuit, it is very difficult to remove heat in the condenser. As a result, the working fluid cooling circuit is thereby improved, in particular with regard to the regulation in general.

In a development of the invention, the radiator bypass has a radiator bypass control valve. Thus, the distribution of the flow through the radiator and / or the radiator bypass can be arbitrarily set or divided.

In a further embodiment of the invention, the radiator bypass control valve is arranged on the input side or output side of the radiator bypass in the working fluid cooling circuit. As a result, for example, a consideration of special conditions of a working fluid cooling circuit is possible.

In an advantageous embodiment of the invention, the radiator bypass control valve is a 3-way valve, a thermostat or other arbitrarily controlled or not controlled valve. Again, a selection is made according to the circumstances.

In a further development of the invention, the working fluid cooling circuit has its own working fluid cooling pump. This embodiment will be used in particular for an independent working fluid circuit. In principle, however, a working fluid cooling pump can also be provided with a connection of the working fluid cooling circuit, which in turn is provided in a further embodiment, to a cooling circuit of the internal combustion engine.

• – Durch den Kühlerbypass entsteht ein weiterer Freiheitsgrad bei der Regelung der Kühlmitteltemperatur in dem Arbeitsfluidkühlkreislauf.
• – Der Kühlmittelvolumenstrom und die Kühlmitteltemperatur können unabhängig voneinander geregelt werden durch beispielsweise die Drehzahl der separaten Arbeitsfluidkühlpumpe für den Arbeitsfluidkühlkreislauf oder den Zumischgrad bei einer Kombination mit dem Kühlmittelkreislauf (ohne separate Arbeitsfluidkühlpumpe).
• – Die Aufheizphase des Arbeitsfluidkühlkreislaufs kann verkürzt werden.
• – Das System wird unabhängiger von tieferen Umgebungstemperaturen und eine Vermeidung von dem Auftreten von Unterdruck ist möglich sowie die Sensibilität zur Füllmenge des Arbeitsfluidkühlkreislaufs ist geringer.
• – Im Fall eines gekoppelten Arbeitsfluidkühlkreislaufs und Kühlmittelkreislaufs ist die Voraussetzung für ein schnelleres Aufwärmen des Kühlmittels des Kühlmittelkreislaufs über Abgaswärme möglich.

In summary, the following advantages are achieved:

• - Through the radiator bypass creates a further degree of freedom in the control of the coolant temperature in the working fluid cooling circuit.
• The coolant volume flow and the coolant temperature can be controlled independently of each other by, for example, the speed of the separate working fluid cooling pump for the working fluid cooling circuit or the Zumischgrad in combination with the coolant circuit (without separate working fluid cooling pump).
• - The heating phase of the working fluid cooling circuit can be shortened.
• - The system is independent of lower ambient temperatures and avoiding the occurrence of negative pressure is possible and the sensitivity to the filling amount of the working fluid cooling circuit is lower.
• In the case of a coupled working fluid cooling circuit and coolant circuit, the prerequisite for a faster warming up of the coolant of the coolant circuit via exhaust heat is possible.

In a further embodiment of the invention, the working fluid cooling circuit has a capacitor bypass to the condenser, which in turn can have an arbitrarily arranged and designed condenser bypass control valve in a further embodiment. Also by these embodiments, the working fluid cooling circuit is improved in particular with regard to the scheme.

• – Es erfolgt eine Entkopplung des Volumenstroms in dem Kühler und in dem Kondensator, wodurch eine flexiblere und gleichzeitig bedarfsgerechte Kühlkapazitätsverlagerung und Kühlung des Arbeitsfluidkühlkreislaufs möglich ist. Somit ist eine einfachere bedarfsgerechte Kühlflächenvergrößerung des Kühlmittelkühlers möglich.
• – Dies bringt den Vorteil mit sich, dass durch das Verlagern von Kühlbedarf von dem Kühlmittelkreislauf in den Arbeitsfluidkühlkreislauf eine Inbetriebnahme eines Lüfters vermieden beziehungsweise verzögert werden kann. So ist es beispielsweise möglich, durch das vollständige Bypassen des Kondensators kurzzeitig sämtliche Kühlkapazitäten für die Fahrzeugkühlung, also für den Kühlmittelkreislauf zu verwenden.
• – Freie Kühlkapazitäten in dem Arbeitsfluidkühlkreislauf können für den Kühlmittelkreislauf genutzt werden, ohne dass der Volumenstrom des Kühlmittels in dem Kondensator beziehungsweise mögliche Druckverluste ansteigen. Dies hat den Vorteil, dass trotz Qualifizierung des Arbeitsfluidkühlkreislaufs für den Kühlmittelkreislauf keine gesonderte Auslegung des Kondensators für beispielsweise höhere Volumenströme notwendig ist.

Advantages of the capacitor bypass are:

• - There is a decoupling of the volume flow in the cooler and in the condenser, whereby a more flexible and at the same time needs-based cooling capacity displacement and cooling of the working fluid cooling circuit is possible. Thus, a simpler needs-based cooling surface enlargement of the coolant radiator is possible.
• - This has the advantage that can be avoided or delayed by the relocation of cooling demand from the coolant circuit in the working fluid cooling circuit commissioning of a fan. Thus, it is possible, for example, to use all the cooling capacities for vehicle cooling, ie for the coolant circuit, for a short time by completely bypassing the capacitor.
• - Free cooling capacities in the working fluid cooling circuit can be used for the coolant circuit without the volume flow of the coolant in the condenser or possible pressure losses increase. This has the advantage that despite qualification of the working fluid cooling circuit for the coolant circuit no separate design of the capacitor for example, higher volume flows is necessary.

Further advantageous embodiments of the invention are described in the drawings, are described in more detail in the embodiments illustrated in the figures of the invention.

Show it:

1 a working fluid cooling circuit of a waste heat recovery system with a cooler bypass in a first embodiment,

2 a working fluid cooling circuit with a cooler bypass in a second embodiment,

3 a working fluid cooling circuit with a capacitor bypass in a first embodiment,

4 a working fluid cooling circuit with a capacitor bypass in a second embodiment,

5 1 is a schematic circuit diagram of a waste heat recovery system having a working fluid circuit and a working fluid cooling circuit connected to a coolant circuit of a cooling system of an internal combustion engine in a first embodiment;

6 a detailed view of a coupling of a working fluid cooling circuit with a coolant circuit in a further embodiment,

7 a detailed view of a coupling of a working fluid cooling circuit with a coolant circuit in a further embodiment and

8th a schematic diagram of a waste heat recovery system with a working fluid circuit and a working fluid cooling circuit, which is connected to a coolant circuit of a cooling system of an internal combustion engine in a further embodiment.

The 1 and 2 show different embodiments of a working fluid cooling circuit 34 a waste heat recovery system 3 an internal combustion engine 1 with one of a radiator bypass control valve 47 controlled cooler bypass 46 to a cooler 35 , The working fluid cooling circuit 3 can be an independent circuit with its own working fluid cooling pump 50 be or else with or without your own working fluid cooling pump 50 with a coolant circuit 20 the internal combustion engine 1 - as in the 5 to 8th presented - combined. The same applies mutatis mutandis to each in the 3 and 4 shown working fluid cooling circuit 3 with a capacitor bypass 44 , The complete waste heat recovery system 3 is particularly associated with 5 explained.

Through the radiator bypass 46 it allows that part of it through the working fluid cooling circuit 34 circulating volume flow of the coolant, which may be, for example, cooling water, to the radiator 35 is passed while the entire volume flow through a condenser 31 who, in turn, enters a working fluid cycle 19 the waste heat recovery system 3 is involved. The passage on the radiator 35 is at low temperatures advantageous because otherwise very low pressures in the working fluid cooling circuit 34 arise. These pressures in turn mean high demands on the components and the capacity. In addition, at low pressures in the working fluid cooling circuit 34 only very difficult heat in the condenser 31 can be withdrawn. One countermeasure would be the mass flow in the working fluid cooling circuit 34 or to reduce the extra pump very much. However, such a measure is at very low coolant temperatures in the Working fluid cooling circuit 34 not enough, which is why a "bypass" of the radiator 35 over the radiator bypass 46 is beneficial. The radiator bypass control valve 47 can be both active, for example, via the control device 37 as well as passively controlled, for example in the case of training as a thermostat. The radiator bypass control valve 47 can be both downstream and upstream of the radiator 35 in the working fluid cooling circuit 34 be installed. Any combination of types of radiator bypass control valve 47 (passive or active) and each installation location (downstream, upstream of the radiator 35 ) is possible.

The in the 3 and 4 shown detail views basically show previously described embodiments of the working fluid cooling circuit 34 , wherein in both figures the working fluid cooling circuit 34 one of a condenser bypass control valve 45 controlled capacitor bypass 44 to the capacitor 31 and the working fluid cooling circuit 34 here each without its own working fluid cooling pump 50 with the coolant circuit 20 combined. As previously stated, the working fluid cooling circuit 34 but also an independent circuit with its own working fluid cooling pump 50 be. The condenser bypass control valve 45 can both be active via, for example, a control device 37 (please refer 5 ) or passively controlled in the form of a thermostat. The condenser bypass control valve 45 can be both downstream as well as upstream of the condenser 31 in the working fluid cooling circuit 34 to be built in. In principle, any combination of valve types (passive or active) and any installation position (downstream, upstream) is possible. The benefit of this capacitor bypass 44 is also independent of a later-explained parallel or serial circuit of the working fluid cooling circuit 34 and the coolant circuit 20 relative to the coolant pump 22 ,

5 shows the waste heat recovery system 3 that on an internal combustion engine 1 with a cooling system 2 is installed. The internal combustion engine 1 also has a fresh gas line 4 and an exhaust pipe 5 on. About the fresh gas line 4 becomes the internal combustion engine 1 Combustion air supplied in the embodiment of the compressor 6 an exhaust gas turbocharger 7 in turn, from one into the exhaust pipe 5 switched on turbine 8th is driven, is compressed. The compressor 6 are a charge air cooler 9 and a throttle 10 downstream. The individual combustion chambers of the internal combustion engine 1 with simultaneous supply of fuel, for example diesel fuel, supplied fresh gas burns in combustion chambers of the internal combustion engine 1 while generating work, for example, via a geared to the crankshaft of the internal combustion engine 1 connected output shaft 11 to a drive axle 12 is discharged, with the any vehicle into which the internal combustion engine 1 is installed, is driven. About the exhaust pipe 5 This will be in the combustion chambers of the internal combustion engine 1 burned mixture of fuel and fresh gas as hot exhaust gas eventually discharged into the environment. The exhaust pipe 5 is with the fresh gas line 4 via an exhaust gas recirculation line 13 with a switched exhaust gas recirculation cooler 14 and an exhaust gas recirculation valve 15 connected. About the exhaust gas recirculation line 13 is controlled exhaust gas in the fresh gas line 4 in particular to reduce harmful exhaust emissions. Downstream of the turbine 8th is an exhaust aftertreatment device 16 , which has, for example, a soot filter and / or catalyst turned on. The exhaust aftertreatment device 16 is also intended to reduce harmful exhaust emissions. Further downstream is in the exhaust pipe 5 a heat exchanger in the form of a superheater 17 the waste heat recovery system 3 switched on, which via an exhaust pipe bypass 18 controlled bypassed. The superheater 17 is in a working fluid circuit 19 the waste heat recovery system 3 - As explained in more detail below - involved.

The internal combustion engine 1 still has the cooling system 2 with the coolant circuit 20 on. The cooling system 2 serves for cooling the internal combustion engine 1 and has one in the coolant circuit 20 built-in coolant radiator 21 and a coolant pump 22 on. The coolant pump 22 promotes the coolant through the cooling chambers of the internal combustion engine 1 in the coolant cooler 21 , the output side with the suction side of the coolant pump 22 connected is. The coolant cooler 21 is via one of a coolant bypass valve 23 controlled coolant bypass 24 bypassed. The passage through the coolant bypass 24 especially with cold coolant and cold engine 1 for quickly reaching the operating temperature of the coolant and the internal combustion engine 1 connected. Into the coolant circuit 20 are still a lubricating oil heat exchanger 25 and a retarder heat exchanger 26 involved. In the lubricating oil heat exchanger 25 This is done through a lubricating oil circuit 27 circulated lubricating oil of the internal combustion engine cooled while in the retarder heat exchanger 26 a through a retarder 28 circulating working hydraulic fluid is cooled. The retarder 28 is for example with the output shaft 11 connected. The lubricating oil heat exchanger 25 and the retarder heat exchanger 26 can be as shown in the coolant circuit 20 or be turned on in another constellation. Furthermore, the intercooler 9 and the exhaust gas recirculation cooler 14 in a suitable manner in the coolant circuit 20 involved.

Coming back to the waste heat recovery system 3 this indicates the working fluid circuit 19 with the in the exhaust pipe 5 switched on superheater 17 on. Furthermore, in the working fluid circuit 19 an expansion machine 29 turned on by the one in the superheater 17 in the gaseous state transferred working fluid under expansion of the same is driven and power to the internal combustion engine 1 or another machine, for example a generator. Here is the expansion machine 29 via a controlled working fluid bypass 30 bypassed. Furthermore, downstream of the expansion machine 29 in the working fluid circuit 19 the capacitor 31 switched on, in which the working fluid is normally cooled back to the liquid state and then a working fluid pump 32 is supplied. The working fluid pump 32 For example, is electrically driven and promotes the cooled working fluid back to the superheater 17 , The output side of the working fluid pump 32 a pressure equalization tank 33 in the working fluid circuit 19 switched on.

The aforementioned capacitor 31 is in turn part of the working fluid cooling circuit described in connection with the previous figures 34 who the cooler 35 having. The cooler 35 is for example in front of or behind the coolant cooler 21 arranged and is from a cooling air flow, for example, from one of the internal combustion engine 1 directly or indirectly driven fan 36 flows through.

When in the 5 illustrated embodiment of the overall system is working fluid cooling circuit 34 with the coolant circuit 20 connected and the working fluid cooling circuit 34 and the coolant circuit 20 have a common coolant pump 22 for a common coolant on. This will create a separate working fluid cooling pump 50 ( 1 and 2 ) for the working fluid cooling circuit 34 saved. The various possibilities of interconnecting the coolant circuit 20 and the working fluid cooling circuit 34 will be explained in detail below.

For controlling the internal combustion engine 1 and the components described above and possibly also other components such as the fuel injection system is an electronic control device 37 present, for example, according to the specifications of a vehicle driver and state variables of the overall system, such as temperature readings T and pressure readings p, which are recorded at any points controls the overall system.

In the in 5 illustrated embodiment is the working fluid cooling circuit 34 on the output side of the capacitor 34 on the suction side of the coolant pump 22 via a connection 48a with the coolant circuit 20 connected.

• – Es entfällt eine eigene Arbeitsfluidkühlpumpe 50 für den Arbeitsfluidkühlkreislauf 34; deren Funktion übernimmt die Kühlmittelpumpe 22.
• – Es entfallen weitere Komponenten in dem Arbeitsfluidkühlkreislauf 34, wie beispielsweise ein Ausgleichsbehälter, Anschlüsse zum Befüllen und Entlüften des Arbeitsfluidkühlkreislaufs 34 und sonstige Komponenten.
• – Es erfolgt eine Entschärfung von Sicherheitsanforderungen, die beispielsweise bei Verwendung einer zusätzlichen elektrischen Arbeitsfluidkühlpumpe 50 für den Arbeitsfluidkühlkreislauf 34 erforderlich wären, denn wenn die mechanische Kühlmittelpumpe 22 ausfällt, muss auch das Fahrzeug stehen.
• – Es ist die Nutzung von einem sehr hohen Massenstrom durch den Kühlmittelkreislauf 20 möglich. Die beispielsweise elektrisch betriebene separate Arbeitsfluidkühlpumpe 50 für den Arbeitsfluidkühlkreislauf 34 ist typischerweise begrenzt auf eine Fördermenge von zwei Kilogramm pro Sekunde. Dies könnte unzureichend sein bei hoher Umgebungstemperatur und einer hohen Last des Abwärmerückgewinnungssystems 3, um die Siedetemperatur des Kühlmittels des Arbeitsfluidkühlkreislaufs nicht zu überschreiten.
• – Es ist die Voraussetzung für ein schnelles Aufwärmen des Kühlmittelkreislaufs 20 über Abgaswärme geschaffen.
• – Der Kühler kann zusätzlich zur effizienten Kühlung der Brennkraftmaschine 1 und zur Optimierung des gesamten Wirkungsgrades der Brennkraftmaschine 1 zusammen mit dem Abwärmerückgewinnungssystem 3 genutzt werden.
• – Für den Fall, dass das Abwärmerückgewinnungssystem 3 nicht aktiv ist, beziehungsweise wenn dieses noch Reserven in dem Arbeitsfluidkühlkreislauf 34 aufweist, kann dieser ebenfalls zur Kühlung der Brennkraftmaschine 1 genutzt werden. Dies bietet die Möglichkeit, Kühlsystemkapazitäten aus dem Kühlmittelkreislauf 20 und dem Arbeitsfluidkühlkreislauf 34 nach Bedarf zu verwenden und damit kann die Inbetriebnahme des Lüfters 36 verzögert beziehungsweise verhindert werden.
• – Bei einer Abschaltung des Abwärmerückgewinnungssystems 3 ist eine virtuelle Erhöhung der Kühlflächen des Kühlsystems 2 der Brennkraftmaschine 1 möglich.

Delivery side of the coolant pump 22 is the working fluid cooling circuit 34 also with the coolant circuit 20 here via a connection 48b connected, wherein the delivery side of the coolant pump 22 and the connection 48b in the supply line 49 to the radiator 35 a valve 38 in the working fluid cooling circuit 34 is turned on. At the connection 48b is the common coolant of the working fluid cooling circuit 34 and the coolant circuit 20 at a comparable temperature level. Is the valve 38 Open, a defined amount of coolant from the coolant pump 22 in the coolant circuit 20 and the working fluid cooling circuit 34 promoted. By increasing closure of the valve 38 is the through the working fluid cooling circuit 34 circulating amount of the coolant is reduced to a perfect shut-off. At the in 5 illustrated and previously described embodiment are the coolant circuit 20 and the working fluid circuit 34 based on the common coolant pump 22 connected in parallel. Advantage of these described embodiments is:

• - It eliminates its own working fluid cooling pump 50 for the working fluid cooling circuit 34 ; their function is handled by the coolant pump 22 ,
• - It accounts for more components in the working fluid cooling circuit 34 , such as a surge tank, ports for filling and venting the working fluid cooling circuit 34 and other components.
• - There is a mitigation of safety requirements, for example, when using an additional electric working fluid cooling pump 50 for the working fluid cooling circuit 34 would be necessary, because if the mechanical coolant pump 22 fails, the vehicle must also stand.
• - It is the use of a very high mass flow through the coolant circuit 20 possible. The example electrically operated separate working fluid cooling pump 50 for the working fluid cooling circuit 34 is typically limited to a flow rate of two kilograms per second. This could be insufficient at high ambient temperature and high load of the waste heat recovery system 3 in order not to exceed the boiling temperature of the coolant of the working fluid cooling circuit.
• - It is the prerequisite for a quick warm-up of the coolant circuit 20 created via exhaust heat.
• - The radiator can be used in addition to the efficient cooling of the internal combustion engine 1 and to optimize the overall efficiency of the internal combustion engine 1 together with the waste heat recovery system 3 be used.
• - In the event that the waste heat recovery system 3 is not active, or if this still reserves in the working fluid cooling circuit 34 has, this can also for cooling the internal combustion engine 1 be used. This offers the possibility of cooling system capacities from the coolant circuit 20 and the working fluid cooling circuit 34 to use as needed and thus allows the commissioning of the fan 36 delayed or prevented.
• - When switching off the waste heat recovery system 3 is a virtual increase in the cooling surfaces of the cooling system 2 the internal combustion engine 1 possible.

In the 6 in a detailed representation reproduced connection of the working fluid cooling circuit 34 to the coolant circuit 20 is different from that of 5 in that here, although the working fluid cooling circuit 34 conveying side of the coolant pump 22 also via the connection 48a with the coolant circuit 20 connected, but here in the supply line 49 to the radiator 35 no valve 38 is available. In place of this is before the suction-side connection 48a a trained as a thermostat 3-way valve 39 in the working fluid cooling circuit 34 arranged, whose preferably third connection via a connecting line 40 with the supply line 49 to the radiator 35 downstream of the conveyor-side connection 48a connected is. In the connection line 40 is one in the direction of the radiator 35 opening check valve 41 built-in. About the designed as a thermostat 3-way valve 39 Thus, a defined volume flow of coolant from the working fluid cooling circuit 34 in the coolant circuit 20 be routed while the connection line 40 with the check valve 42 a bypass to the connections 48a . 48b forms. So that means, the working fluid cooling circuit 34 can with appropriate position of the 3-way valve 39 from the coolant circuit 20 shut off and it flows as a result, no coolant through the working fluid cooling circuit 34 ,

In the embodiment according to 7 is the working fluid cooling circuit 34 again as described above on the delivery side and the suction side of the coolant pump 22 with the coolant circuit 20 about connections 48a . 48b connected, here in the supply line 49 in front of the radiator 35 the 3-way valve 39 is arranged. Again, preferably the third port of the 3-way valve 39 over the connecting line 40 over the connection 48a with the suction side of the coolant pump 22 connected. Depending on the position of the 3-way valve 39 gets coolant through the radiator 35 (according to arrow 1) or through the connecting line 40 (Arrow 2) back to the suction side of the coolant pump 22 promoted. It is the over the connection 48b taken volume flow of the coolant at all positions of the 3-way valve 39 almost the same. To prevent working coolant from going the wrong way back to the condenser 31 is promoted here is the output side of the capacitor 31 in the to the connecting line 40 or connection 48a leading line of the working fluid cooling circuit 34 the check valve 41 arranged. The 3-way valve 39 can in the embodiments according to 2 and 3 be a complex valve or consist of several valves.

While in the embodiments of the 5 to 7 the working fluid cooling circuit 34 and the coolant circuit 20 relative to the coolant pump 22 are connected in parallel to each other, they are in the embodiment according to 8th connected in series with each other. Here promotes the coolant pump 22 Coolant by the internal combustion engine 1 and then through the coolant cooler 21 or the coolant bypass 24 , Then there is a connection 48b to the working fluid cooling circuit 34 in front of the radiator 35 via a connection line 42 , Through the downstream of the junction of the connection line 42 in the working fluid cooling circuit 34 arranged valve 38 the mass flow of the coolant through the working fluid cooling circuit 34 set. This ensures that especially when the valve is fully open 38 that of the coolant pump 22 pumped coolant through the radiator 35 and then through the capacitor 31 is downstream, downstream of the connection 48a a suction connection line 43 that the working fluid cooling circuit 34 suction side with the coolant pump 22 connects, a check valve 41 arranged. Otherwise, the system shown corresponds to the in 1 illustrated system.

Finally, it is pointed out that any individual features described above can be combined with each other and with each other.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013205648 A1 [0002]
• DE 102014019684 A1 [0003]

Claims (10)

Waste heat recovery system ( 3 ) for an internal combustion engine ( 1 ), comprising a working fluid circuit ( 19 ) with a capacitor ( 31 ), which is further provided with a working fluid cooling circuit ( 34 ), and wherein the working fluid cooling circuit ( 34 ) a cooler ( 35 ), characterized in that the working fluid cooling circuit ( 34 ) a cooler bypass ( 46 ) having. Waste heat recovery system ( 3 ) according to claim 1, characterized in that the radiator bypass ( 46 ) a cooler bypass control valve ( 47 ) having. Waste heat recovery system ( 3 ) according to claim 2, characterized in that the radiator bypass control valve ( 47 ) on the input side of the radiator bypass ( 46 ) in the working fluid cooling circuit ( 34 ) is arranged. Waste heat recovery system ( 3 ) according to claim 2, characterized in that the radiator bypass control valve ( 47 ) on the output side of the radiator bypass ( 46 ) in the working fluid cooling circuit ( 34 ) is arranged. Waste heat recovery system ( 3 ) according to one of claims 2 to 4, characterized in that the radiator bypass control valve ( 47 ) is a 3-way valve. Waste heat recovery system ( 3 ) according to one of claims 2 to 4, characterized in that the radiator bypass control valve ( 47 ) is a thermostat. Waste heat recovery system ( 3 ) according to one of the preceding claims, characterized in that the working fluid cooling circuit ( 34 ) a working fluid cooling pump ( 50 ) having. Waste heat recovery system ( 3 ) according to one of the preceding claims, characterized in that the working fluid cooling circuit ( 34 ) with a coolant circuit ( 20 ) of the internal combustion engine ( 1 ) connected is. Waste heat recovery system ( 3 ) according to one of the preceding claims, characterized in that the working fluid cooling circuit ( 34 ) a capacitor bypass ( 44 ) to the capacitor ( 31 ) having. Waste heat recovery system ( 3 ) according to claim 9, characterized in that the capacitor bypass ( 44 ) a condenser bypass control valve ( 45 ) having.

Images